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The 26th of February 2015 a CEN enquiry was finally launched on two projects related with the determination of odours. The Working Group 27 of the Technical Comittee 264 of the European Committee for Standardization (CEN) had the task of developing this Standard and looks like the final draft is ready.
This European Standard will describe two methods for direct assessment of odours in ambient air and will supplement the dynamic olfactometry method described in EN 13725 which is generally only suitable for measurement of odour emissions at the source, as the practical lower detection limit is typically ≥10 ouE/m3 (according to the Final draft) and cannot be applied directly to determine odour exposure in the field.
Dispersion modeling defines the relationship between the emission source and the receptor. While control measures may be applied to the emission source, compliance with odor nuisance standards depend on whether the odor concentrations at the receptor have been adequately reduced with respect to their frequency, intensity, duration and location.